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1966. Arctic Climate System (ACSYS). This line shapefile contains ice observations in the Arctic region for April 1, 1966. This layer is part of the Arctic Climate System (ACSYS) Histo... Arctic Climate System (ACSYS).

1967. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1967. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1970. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1970. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1971. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1971. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1974. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1974. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1977. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1977. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1982. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1984. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1984. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

1985. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1985. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).